Exposed aggregate is a decorative concrete finish achieved by removing the top layer of cement paste from a poured concrete surface to reveal the aggregate (stones, pebbles, shells, etc.) embedded within. This process creates a textured and visually appealing surface that is commonly used in driveways, pathways, patios, and pool decks, among other outdoor areas.
- Construction Process: Exposed aggregate concrete is typically created by pouring concrete with added aggregate material, such as gravel or crushed stones, into a form. After the concrete has partially cured, the surface layer of cement paste is removed through a process called "exposing," which can be done using various techniques such as water washing, sandblasting, or chemical treatments.
- Aggregate Selection: The aesthetic appeal of exposed aggregate depends on the type, size, and color of the aggregate used. Aggregates can range from natural stones like granite, quartz, or limestone to recycled materials like glass or shells. The choice of aggregate can significantly impact the final appearance of the concrete surface.
- Texture and Grip: Exposed aggregate surfaces offer improved traction and grip compared to plain concrete, making them suitable for outdoor areas where slip resistance is important, such as pool decks or walkways. The exposed stones provide texture underfoot while still maintaining a relatively smooth surface.
- Durability: Exposed aggregate concrete is highly durable and resistant to wear and tear, making it suitable for high-traffic areas. The aggregate materials used are typically strong and resilient, contributing to the overall strength and longevity of the concrete.
- Customization: One of the significant advantages of exposed aggregate is its versatility in design. Contractors can customize the appearance by varying the aggregate type, color, size, and placement, allowing for a wide range of aesthetic options to suit different preferences and architectural styles.
- Maintenance: While exposed aggregate surfaces are relatively low-maintenance, periodic sealing is recommended to enhance durability and protect against staining and weathering. Routine cleaning with a mild detergent and water can help preserve the appearance of the surface over time.
- Cost: The cost of exposed aggregate concrete can vary depending on factors such as the type of aggregate used, the size of the area to be covered, and labor costs. Generally, it is more expensive than traditional plain concrete but less costly than some premium decorative finishes like stamped concrete.